8 
ORGANOGRAPHY. 
BOOK I. 
colourless. Examine the red bladder, and you will find it 
filled with a colouring matter of which the rest are destitute. 
The bright satiny appearance of many richly coloured flowers 
depends upon the colourless quality of the tissue. Thus, in 
Thysanotus fascicularis, the flowers of which are of a deep 
brilliant violet, with a remarkable satiny lustre, that appear- 
ance will be found to arise fi'om each particular cell containing 
a single drop of coloured fluid, which gleams through the 
white shining membrane of the tissue, and produces the flick- 
ering lustre that is perceived. Colouring matter of the cellular 
tissue is frequently fluid, but is in the leaves and other parts 
more commonly composed of granules of various sizes : this is 
particularly the case in all green parts ; in which the granules 
lie amongst greenish liquid, the latter of which, as the cells 
grow older, dries up, while the granules themselves gradually 
change to olive green, and finally to brown. 
Kieser distinguishes three sorts of globules among tissue : 
— 1. Round extremely transparent bodies, of a more or less 
regular figure, found principally in young plants and in coty- 
ledons, and soluble in boiling water ; it is these that constitute 
starch or faecula. 2. Globules of a small size, a more irre- 
gular figure, and coloured either green or some other tint. 
They are not soluble in water, but are so in alcohol ; but 
when dissolved, their matter is not precipitated by the addition 
of water, on which account they are distinguishable from 
resinous substances. 3. Extremely small round bodies, vary- 
ing in colour, and found floating in the proper juices of 
vegetables. 
The first mentioned granules are what Turpin calls Glohu- 
line. He believes them to be young cellules, and that it is 
from them that new tissue is developed. There does not, 
however, appear to be any sufficient evidence of this, which 
must be considered at present mere hypothesis. It has, how- 
ever, been substantially adopted by Raspail, who asserts that 
each such granule has a point of attachment, by which it ad- 
heres to the lining of its mother cell ; that it is by the 
developement of such granules and their mutual pressure that 
cellular tissue is produced ; and that all the varied forms 
assumed by the organs of plants may be explained by refer- 
